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Messages - K2-K6

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5161
New Member Introductions / Re: Hi everyone
« on: August 22, 2010, 07:59:38 PM »
Hi and Welcome. Another 3 750's coming out of the woodwork, that's good.

5162
New Member Introductions / Re: New member
« on: August 22, 2010, 07:57:07 PM »
Hi and Welcome. There's some good stuff discussed here and good to see so many running some nice bikes.

5163
CB500/550 / Re: CB500K1 Headlight, European spec
« on: August 22, 2010, 07:35:49 PM »
As some of the above, I've used Cibie Z beam which is a really good light but I don't like the pattern when it's leant over (good on a car as the reach on dip is really good in not going toward oncoming traffic but still shows road edge well) as the cutoff is so sharp and the Stanley H4 has more spread to cope with this. H4 has the best main beam for a single unit I've ever used without auxillary lights.

Don't think you'd be dissapointed with either though.

5164
CB350/400 / Re: Front brake!
« on: August 18, 2010, 11:47:08 PM »
Good response from Chris, covers just about everything you should be doing.

To add a bit to this about the seal and how it works: I believe the seals of this type deform in cross section as the piston drags out past them it is dragged further out at the piston contact point, when you release the brake pressure the seal elasticity? pulls the seal back to it's original shape and has the effect of taking the piston with it back into the caliper so giving a small pad to disc clearance and hence no binding.

It's vital to clean the seal area as chris says to restore the tolerances that enable this to happen. Only a small amount of muck/corrosion on the pad side of the caliper seal effectively blocks the space for the seal to operate as designed so it's critical. also I have always been able to return bike caliper pistons into the bore with two thumb pressure, it's a good measure of the piston not binding.

5165
CB750 / Re: My F2 Rebuild
« on: August 18, 2010, 08:20:15 PM »
Brilliant old photos coming out, nice to see some stuff from this era.

I had a yoshimura pipe on a K2 (bought it at the dixon shop in Godalming) black one as yours mostly rotted from inside but still have remains. Also have access to a almost new one on 750 F2 the owner of which said I could use to get a copy made............. so loosely thinking of exploring getting one made in stainless have done no work on it so far and guess that it's not possible to market someone elses design. So if I can find a scource then see if any interest in getting some made as a group together kinda thing.
As you say they have a wiered balance between quite at low revs along with a good top end noise plus good flow.

I bet that CBX sounded sweet!!!!

Kal Gaurd.......there's a blast from the past. Mostly used their "Chain Kote" since the seventies and now  the only one I buy, the graphite one. This makes chains last longer than anything I've seen just apply it when you get home after a run and it stays on the chain then.

5166
CB500/550 / Re: CARB help
« on: August 16, 2010, 10:54:52 PM »
Are the "out of box settings" suggested as a start point for that application?

Main jet controls total max demand when wide open slightly trimmed by needle i believe. So has to supply enough to feed the motor at max load, may need someones experience to guide you here.

Needle controls mid range by restricting the amount that flows through main jet at less than full open. Shouldn't require too much shift from central to work (if main is correct) but may require different taper for different application/engine spec.

Idle circuit trims demand when main / needle are effectively closed. So really needs to be considered seperately to the rest to get it starting and running half well.

5167
CB500/550 / Re: CB500K1 Headlight, European spec
« on: August 16, 2010, 10:38:25 PM »
Most 7" units car/bike have the same lug orientation so will usually fit straight in  to these rims just depends if you want to keep it original or not.

The later "Stanley H4" from CB900 has a really good beam pattern as well, used two of them in a car (Triumph TR8) before and they gave brilliant vision.

5168
CB750 / Re: F1 rebuild and stuck front wheel spindle!
« on: August 16, 2010, 09:43:38 PM »
Allen bolts can vary in material strength, so make sure you use good quality keys so they don't round out, I prefer all flat sides as opposed to multi-angle heads if I think that high torque will be required to release them.

Seems like you're getting along fine anyway, are you going to completely strip the motor? if so it's worth considering new primary and cam chains as these are just about the first thing you put on during a build up so a lot of labour if you need to do them later.

5169
CB750 / Re: My F2 Rebuild
« on: August 16, 2010, 09:28:25 PM »
I guess the original shocks were not of a high end spec anyway, they did the job and I thought they weren't too bad compared to others at the time but by no means a precision spec that we may be used to now. I would have thought that they're worth keeping in stock if not serviceable just because they represent an orignal part of the bike.

You say that you had someone look at them at work who thought they'd had it, it's likely that they would say the same for a spec like that when new anyway as they just would not match up to any critical current appraisal anyway, spose things move on like that!

That looks like a Yoshimura pipe in your heading photo? always liked that design for SOHC 750's, just really neat looking, Bubadel also has the same on his one elsewhere on this site.

5170
CB750 / Re: My F2 Rebuild
« on: August 12, 2010, 09:56:52 PM »
Looks good so far, though watching all this activity seems to be something of a substitute far doing something on my own bikes.

One of the mods we used to do on these bikes in their prime was to replace the lock stops on the lower fork clamp with a larger square block welded on as they break really easily and even a simple fall from a side stand can dent the tank as it runs so close to the back of the legs / handlebars.

It's good to see the whole build taking place, thanks for your efforts in showing us.

5171
CB750 / Re: F1 rebuild and stuck front wheel spindle!
« on: August 12, 2010, 09:39:03 PM »
Just a tip for screws that could be stuck (don't know if you already may do this) especially engine cases etc; use a larger sized pin punch to gently tap any burred metal around the cross head of the screws back into original place. Then using a good quality / new impact driver tip, tap that into the screw head for a tight fit and either use a socket and T bar to lean on it or impact driver they normally come out.

Usually if you start at them half hearted then you get more rounding off and then stuck, if you prep them up first you can get a much higher first time success.

5172
Yep they seem quite a good match for original, got one on a CBX750 and it runs fine on completely original jetting right from low to high so their claims appear to be fair.

It's always good if you can find the real reason for any problems to help avoid them happening again.

5173
Other Bikes / Re: CB500t; has anyone here owned one?
« on: August 06, 2010, 09:28:13 PM »
I've only really owned Jap stuff but more recently rode some brit twins (BSA 650, Triumph 750) from late 60's mid 70's and still can't quite believe how much they shake!!! and the Triumph felt quite slow which I "discussed" with the owner who said I needed to rev it more. Sure it was faster but just felt so cruel to it, like it was going to smash itself to bits. I wouldn't want to own one. I think you'd have had to produced kids if you were thinking about it before subjecting yourself to that level of industrial strength vibration ;-D

Also heard bad reports about 500T Honda, Friend had one that he was always repairing.

Odd choice but can be low cost is a Ducati Monster 600, one of the sweatest twins you'll ever experience and they feel so light almost bicycle like to ride. Try one if you get a chance, think they did a low cost no frills in black only called "Monster Dark". And they're SOHC per cylinder so almost count.

5174
CB500/550 / Re: good old fashioned british know how
« on: August 05, 2010, 09:36:22 PM »
Sounds like it's coming along though, some pics would be interesting to see.

I've even ridden many things with "get you home" interpretations in the past but everyone gets so serious about stuff like that now so if anything is percieved as wrong somebody somewhere starts demanding answers.

I think the original reason for two cables was that they normally had one return spring so in the event of failure you could manually close the throttle. If you have more / backup springs, then I'd guess you've no need to have a second cable.

5175
CB750 / Re: sandcast or not.
« on: August 04, 2010, 11:00:44 PM »
I've had one sand blasted before, complete assembled cases before strip down and make wooden plugs to cover oil pipe and starter-motor holes and replace any bolts if you want to keep originals. Obviosly this gives the same finish to all cases unless you've got extra rocker and alternator castings. This gives the best finish for painting either silver or black.

Originally all main cases, barrels and head casting were a greyish / silver aluminium-ish painted finish (should be a piece of p to mix up ;-) with the cam, alt and gearbox covers loosely polished but not too shiny, just laquered.

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